#include <stdio.h>

int main()
{
    unsigned char ch, ch1;
    for (ch = 0; ch < 128; ch++)
    {
        printf("%3d ->> %c ", ch, ch); // 转化关系，实在printf函数中实现的
        if(ch %32 == 0)
        {
            putchar(10);
        }
    }

    printf("\n\n\n========================================\n\n\n");
    for (ch1 = 'a'; ch1 <= 'z'; ch1++)
    {
        printf("%3d ->> %c ", ch1, ch1); // 转化关系，实在printf函数中实现的

    }

    return 0;
}
